Package org.eclipse.mat.query.quantize

Class LatestValueFunction

java.lang.Object

org.eclipse.mat.query.quantize.LatestValueFunction

All Implemented Interfaces:

Quantize.Function.Factory

public final class LatestValueFunction
extends Object
implements Quantize.Function.Factory

Simple quantize function which just returns the last value add to the distribution bucket.

Its purpose is performance optimization: Assume you want to create a frequency distribution on column value A and you know there is a 1:1 relationship to column value B, one can use the LatestValueFunction to display column value B instead of adding B to the composite key (A,B).

Constructor Summary

Constructors

Constructor	Description
LatestValueFunction()

Method Summary

Modifier and Type	Method	Description
Quantize.Function	build()	Builds a new function.
Column	column(String label)	Creates a new column to display the values of a function.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LatestValueFunction

public LatestValueFunction()

Method Details

build

public Quantize.Function build()
                        throws Exception

Description copied from interface: Quantize.Function.Factory

Builds a new function.

Specified by:

build in interface Quantize.Function.Factory

Returns:

the new function.

Throws:

Exception - if there is a problem constructing the new Function.

column

public Column column(String label)

Description copied from interface: Quantize.Function.Factory

Creates a new column to display the values of a function.

Specified by:

column in interface Quantize.Function.Factory

Parameters:

label - the readable valued used to label the column

Returns:

the new Column